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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af5d37beac36b71a8a3769a5e734c418c0fb7f477e166460565e9c92451743f4' 
  AND token = 'bvZwUZYJnlL6CMT70IiytT94nuRkbDb+yPHsigRG0x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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