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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8bb2a53e4b9af9f0ce7233762ae7c2199f5d25b27d7b27c38c3a0c14d89ddc9' 
  AND token = 'fUWlu/oJo3608j564TPPa0ix5nMZlUm6Bz15Tv4A2U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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