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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f4a0de4e07ffc05188c1cd1d4acfea669a595f00fe3e95dc4b6aa8ed6675078' 
  AND token = 'yU+B3Mni0uw8ebTkNSBMA3o5bU2xR15VnX1DAKqBjn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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