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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f0e87c1a2fd79b84a80bbbb5839e501e58de43c9c0453a916beb336c3498d77' 
  AND token = 'XV5mgMgdvs/edytki6OVCAppdPV82cw1JHfcGPYObb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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