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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ec41dfc1f82587899488c8cdbd91d66dd38222c0af7438e80e44eb8e79ff814' 
  AND token = 'HcELOSLMm8vxDm6oqro3RUR8QYxPjji2K0+KhLKbnzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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