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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4dca183e9cba2e234aa5a8e8379f707f2976d5a51c7904341ca078602a6ead' 
  AND token = 'Fa7i00QVjAq5qWOkZstcBJD7wgCVlfTLBkVC/2wOwmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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