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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8efdfecc0b71d35f6bc570662688a6ac0837d8c4c94f0816aeec0828c59fdf2e' 
  AND token = '65k8/0WSaNEP47+jJymrw30405JWRjeZnNzS04aKvu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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