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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d2c1305cc4f3f2847952ee3fd4805074d10abc98c4c1352b7eefef7f4f13ff1' 
  AND token = 'N5Q+o3B3n4F4WH1tPJAHefuzRwbuFra9nzQ5a9FQENg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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