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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e09dccf2eab8927b1e48b3651b7167813e663da31c11f381b2c70406171577f1' 
  AND token = 'DvdPT6mRzY/L8lIcPjBNRlzFfmnvLP14P+yca1VFcbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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