SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd60175f730050d9974f2ef3ecfb7f1d941bf837d2a98492dd20f607e523e2ca3' 
  AND token = 'bcZi2a7NXUdF+5Lg3I/27uzdvX64mmhZqV/vGhwmQwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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