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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2db3c70df90c0f3c1d5951ddd7e2d41c5820e513c7c295238a2724b3120b78b1' 
  AND token = 'kyEc3g0X3ZDwlSTSxhuirS86nQBFXFOvC9q5+MqhiN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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