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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '712e48429b35d2c6117a2aa0521093686ed6d8c792cd9ca90c0084e066494b2e' 
  AND token = 'MpJRg0yiuj68ID4HFk7nlbly3U7gelmAw7tKtsJlK1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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