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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '525bab5e6ff64ea05f23c86b10eba56f64a5d2a501c3a417516184f45229ab94' 
  AND token = 'EBNrEvPviRaMqiEIgkG+SJ4FC4Zk0Ejw8c0ZEdOr1PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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