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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21fd9536b7b51b2318c450271ccba5479586a65cbeab8ed4a05edb0273d898a6' 
  AND token = '7utfQC8xxEnzCo80bt6M/X/0ab7vGQQYS6vo2TkpUz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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