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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0fee4e53b75cb17ad3b2fbb79c82a998eaf0ae3167c67cc5fe6bb655449441d' 
  AND token = 'faEuPCUhGSLbUkIEgOeeq+AyxyLnVEwJ7FcDA38XWLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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