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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fba58944121d5afbd0e8482957d9a16709c1f77e0ce00f53cfa4f6270f9ecf1' 
  AND token = 'dt/J5dvNLYr40+2CDH24WMox0TM5Rph0cqcEKWRusmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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