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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44af592c6956b9cd04d4b09b94a9283df2d1539ae6f169386aa5edfb52a7a11c' 
  AND token = 'n6E8ML5qQVkavpBIzLVrHSik2IMi9005spIQ7/Ny+b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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