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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '866154dc217e81498f9daa21d135a57871ddfd96b9029bd04b31db28ef48e097' 
  AND token = 'fWseylNHGmHAsPO7CyRCgNp2ImVdgJdNoJ11BJJZU8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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