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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '318da65195fe4a7fa941a20062bda29f4fbf0de0913122c939fd9d1888c5ef64' 
  AND token = 'VD11wYTWXwQof6H79Ni2aqMaSIsd6gqcDYDVbSvdlfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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