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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aae7cf5bb8f8cbe2375c36dccbdf58ef9b4d633aeecdfb97e93048c07ffcf5e5' 
  AND token = '6tG8yajnkhgh0m+OKKJR+vI7IEStA3TrcvnP2pfDwe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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