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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86515d965aa9d8b824e6127f446310928d073417128ee50827f228bb31d85713' 
  AND token = 'V9+85DXcOh89kYNUzkr8ziFoOpL/0WL6ZWf579RFdb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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