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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab787b0b7c7217f9128de92153e343c79609d3e163ccd89494f0c802cc009b15' 
  AND token = 'j4Dvt5+cA1/fJsw1nXONXNJfuhqvT7Tcdfl0meMNM1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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