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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1144a1cd728e78d5ea254305ee7d83a845e955f756963df6630dad26d0d6fe31' 
  AND token = 'ljc1NmXSyth8GGsg5wAPDARTK+5H7AbSbB4EUSDpZd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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