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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b0c419db5b6115eb91cd05eacdbb0a9bc7af2a480059a9c0dbf5306a93052a0' 
  AND token = 'I2TTnn7lO1zCZeXbnDoy+/h5duLyKVgqpNR/zpKRJCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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