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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1486e79c2cd562ab2cb85725de7bcd28098e88cafcb90a2f65017b1515737cf9' 
  AND token = 'O2eB9J0t6QN3mvsJo15bhqyBpF73zrA6f6gQpeucYIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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