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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7699ac06d4b877e31cea4b820f18900c910d86bd203cd0f11898297c695b43a3' 
  AND token = '6ch2hlts3SRkC5ygl+7QuTstTa6UmnpTH/0f2CiJYOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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