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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c975cf892e58c4dcb9dd5d1f189e4dd2741855b911a13c8e71d725fbe4c0d914' 
  AND token = '48HsX+3Qryaah4gOCANWQ+WZaafQuDp7ZfRQi28Hk54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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