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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c71feea22fbb7f1570e8915cf94645d6fc1f4874b05c7828172de68473b0ea0d' 
  AND token = 'NqljSD+YknwTeGIFe5x9DecXwFAdQC1fRSjWSla6nYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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