SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58788799024a89d11b234f219581b931616e7a005a4dfe1857a9b0de0bbef6bc' 
  AND token = 'B0kA5CBaM/nFrCmrAe15YlpZeaM4WXHzuGY3GJxSKNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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