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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee5ed53e70c40a751565bcd91f6bd60e17a60847ac37b138af7423904fb906bf' 
  AND token = 'nKH3hxyDv7T0CPe48yNz7G4DyT7+EzxN0SK2DOq38vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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