SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8d896774c1304ddc1b41b554a330ad6d4648ed63d536040eab5219ffb41872b' 
  AND token = 's8M2pw/qAvs+mndnqsMrHQ+CR+FMfvyJqJnhuqFL+kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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