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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2856a7ce644cb0a083d2203d532624c2fd93a2a21179525aa001cd6bcacbe2a' 
  AND token = 'w9X0QJEiL0MsyTkVdyQY4AvkkhEcJhESOFNkbN/1FbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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