SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37f0fbc26846ff3c2e3b424af75b1904bbc99d602b8bcefd5daa16fdc21a6c37' 
  AND token = 'Pwtyg8vG3MW0qP/3mj8tN+Lp4Orai9IERr5xYSJsJ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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