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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a502a8b9aa591e665d68645fbf264273803c0dc40acb5b511ae751ae5df02e25' 
  AND token = 'Dq9xuSByzSMtCUH/f1sQtFBoxQfwmZAVpus3r6rHw2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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