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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ba14a74ad5a8e4ab2e0c1d3f180f21afe0c0fe95a8a642b9ca587d217ebb980' 
  AND token = 'AcYnw3/rR6rsnLAf9JMhe3GppLlinhdVV8KrpxTB99o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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