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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '620388f6b7821a9970d75d3e6e1b70896a07bf24e4f1cf0e767514b63c99b941' 
  AND token = 'EcEtJ4dTyY8NTql89yHYZeFONDsstvCHwYV5Zer9c5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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