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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97c662dff741d4a0271448d8a175e5d0021d5b6988699b117518f3f5c9ef0397' 
  AND token = 'fvIYD4+lbJmkN4ndJmAm5oe7eGBCxBGCdsibCT5fnC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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