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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50c5962b2685812c42c69b28ebe2cfb93f537cf2346ca5abf1006e6616c1d63e' 
  AND token = '3M3nKKAG/3oie18FM3q+W2gZqjx12adchK4dXgaIe+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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