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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '022fca57d666663f56a9a5ee4638ba4fa6529c2b1021a0fe06660767144b04d4' 
  AND token = 'XT70fZEfZe9jDtbXJ3QK4PDmYdn2JrSmvpH4Pq/V4RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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