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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c98aeb0cc135211c05112a5cd8e1a051eb2ae2cce2658e1ff17c2fee0547efba' 
  AND token = '1I30uvDBoefUiJquFiiTu6uA6ZGiCIget6LA++lupWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}