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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82caa017c0e7aa8902eadc11b8203b67c4627addea1bf6b2bbddfdf04353d18f' 
  AND token = 'y8nUOz4VsAVgBv0tQl0etev2lowwn9UM1XE82dDmQGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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