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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be22f6385c3a4522808bb5c6c28a9e5ba92705390e8f52de25d4ef7faa8fc800' 
  AND token = 'MOPQpl2Sl7kPCzqOElhx7bwD3s+v9ns5YU3XDl1B1/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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