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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b4e592b8d70593d3ff1a815eedc70ebe2606c5854934b275793d118d2ee22ba' 
  AND token = 'BKGOSqvRTr7aKbonVNTe8KgBnBchnUNBAWD3IpjS5BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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