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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7283b07e95fd0d98ed724f8848125eaabda5b215179582c52c55d2e153fb2cb' 
  AND token = '4ZPdjgO71ba7dAbqGicAV0xmLKjY89bFkUQQ5t4AL1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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