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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14eb36c4a7aeabb84fe3dbcc700f3ce6984eb174d6ad47bc1813042d84e7e742' 
  AND token = 'yklrHuoHx87peGCkvYaRe6E3JRXpCw+Ris2LyR+Lj5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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