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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89fc6b5547a1d38e1332ccffd9913dece9f1776ee94ea4767bd79eab90cc9a28' 
  AND token = 'eLolyLUq1LYJ9c08/4RtnQA4uDT0DbUFBpYo82yg8oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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