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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d48bbe8208c2931280684a124441f437a7d93dfd975281308b58d1b1c0fa292' 
  AND token = 'A7EuhMeTXB0Hzf0+OKFr9bPqEqNr2yA/DyOwpZSyjDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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