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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aab0cb5efe7fa9c8d6eb530df8e25a19ac597cc7cf57025a44001b3bac4cb8b' 
  AND token = 'WTLhR0F5xDTZJDP64FC7oRTSB5z/4zTgOlG5JaUsqnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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