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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd61032a6edb4e077071bbfb140cfa9ad0fee353e46473b37f935de76a1d487e1' 
  AND token = 'kjXWSBWc9MjsgP5M2fFrnql3FIRS2ygXkiN/wrLEUcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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