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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02743921885b3f01a3efe31b7dca77855c13c449893beb88e782cc733e14708f' 
  AND token = 'AlamSI5Vlq7P8mvZXc1FBfUXdib0/KajsUoaZIs2AvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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