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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '877121a1d33f244cc7fb523bfd1c55e9aed6450049a366fb47f62305a7abd213' 
  AND token = '6+7E7900aQ34IcRyXJ93b0i7/HBnrh7FdZJjwAmeGN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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