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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0878478ea5e9027217a6ff6b0fa77ab3ee52faeee39f9f1d1a1f5c2271359e9a' 
  AND token = 'IyY/7Yamio0ZPkQ/mRxdYxuSLTf/47/+hSuu/78oh9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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