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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3424f42218fe744155831768e73c2a7724ef853e6e022407bef7f655f456b21e' 
  AND token = 'l96LwGNVHIZW3o0UzSHkCbnXnHTzQL3lx7ueXlNT9xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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