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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af6ae3533f65146030fe40acf16ee75a93fc95dbad22d543b7445f8ec6b1fdb0' 
  AND token = 'QW/PFgPLVnj5z6bIfL98Xh3T4CwC1clRVm1jj6nsnuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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