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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a30bce539f47e0d5d36df1ab1457128660bd64cc6cf5676304cd6cdd65f2666' 
  AND token = 'coECPWAWev7Sot2wq1JaQObqmjE2ED+0D9vEsb18DJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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