SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bca3edeea69120886e1d631ebda0b794ef7e4fbc8f970790341bff2f6b5f28a' 
  AND token = 'oXuy/r8HWZfcdbgqgzvE3xZHD/I1OVpRa+C5g2QvQ1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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