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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c60af5b6e3f7b91f35fde70525c9a03a2d5aa580a47f6d2d4f08fc6e6ce2f63e' 
  AND token = 'u9GZyc7aQi3opWWPhSok89IomFZPoRHoxIQSPMapqGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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