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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a1a8a85a029b1e3e38c62c213b823718d40f4392aabd4c7d30f029270b01abe' 
  AND token = 'cXHcmoiVxoD3FFzf7zd+0UIm7z8DvBFSePUpjKUz09g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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