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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2583ff7da45fb82ae73b5479f4b486faa4e6d827be97c1804ce24f8bea35ba69' 
  AND token = 'UCoT0ZaDBPOTMih33Mm759HrLRc+j7oX4KD945+CwPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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